<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="js/tools.js"></script>
		<script type="text/javascript">
			function $$ (id){
				return document.getElementById(id);
			}
			window.onload = function(){
				var cnv = $$("canvas");
				var cxt = cnv.getContext("2d");
				
				drawBall(cnv.width /2,cnv.height / 2);
				var x =100;
				var y =75;
				var key =tools.getKey();
				window.addEventListener("keydown",function(e){
					cxt.clearRect(0,0,cnv.width,cnv.height);
					switch(key.direction){
						case "up":
							y-=2;
							drawBall(x,y);
							break;
						case "down":
							y+=2;
							drawBall(x,y);
							break;
						case "left":
							x-=2;
							drawBall(x,y);
							break;
						case "right":
							x+=2;
							drawBall(x,y);
							break;
						default:
							drawBall(x,y);
					}						
				},false);
				function drawBall(x,y){
					cxt.beginPath();
					cxt.arc(x,y,20,0,360*Math.PI /180,true);
					cxt.closePath();
					cxt.fillStyle='#6699FF'
					cxt.fill();
				}
			}
		</script>
	</head>
	<body>
		<canvas id="canvas" width="200" height="150" style="border: 1px dashed gray;"></canvas>
		<p id="txt"></p>
	</body>
</html>
